Noise reduction in motor boat cockpits and cabins possible

Boaters increasingly require convenience and quieter boats. Boating is unpleasant for the skipper and passengers if it is difficult to hear normal conversation in the cockpit. VTT's Quiet boats project examined both short-term solutions applicable to existing boats and factors affecting noise level that can be taken into account in the design of new boats.

The noise level of motor boat interiors can be affected - and reduced. Placing an acoustic enclosure around the engine and sealing any openings between the engine bay and the cockpit proved to be the most efficient 'quick fixes'.

The project has given boat makers access to practical research data on the origin of noise and ways of reducing it that can be directly applied to product development. Some of the companies involved in the project have already applied the results in their production. "Thanks to the results of the Quiet boats project these businesses now have a foundation on which to base their own further investigations and the product development of even quieter boats", says Senior Research Scientist Hannu Nykänen of VTT.

The study focused on cabin cruisers between 6 and 14 metres in length fitted with one or two sterndrive engines. The project began with the analysis of the noise levels, sound quality and intelligibility of speech in the cockpit and passenger cabin of the boat types selected as reference boats by the boatyards involved.

The project was carried out in cooperation with four Finnish boat sector companies: Bella Boats, Oy Botnia Marin Ab, Tristan Boats Ltd and Volvo Finland Ab. The University of Kuopio joined VTT in the research cooperation. The Quiet boats project is part of the Tekes Boat Programme 2007.

Wise deliberation sustains cooperationGiving people time to think about cooperating on a task can have a positive effect if they are big-picture thinkers, but if they tend to focus on their own, immediate experience, the time to think may make them less cooperative, University of Waterloo research has found.

Best Science Podcasts 2019

AnthropomorphicDo animals grieve? Do they have language or consciousness? For a long time, scientists resisted the urge to look for human qualities in animals. This hour, TED speakers explore how that is changing. Guests include biological anthropologist Barbara King, dolphin researcher Denise Herzing, primatologist Frans de Waal, and ecologist Carl Safina.

#534 Bacteria are Coming for Your OJWhat makes breakfast, breakfast? Well, according to every movie and TV show we've ever seen, a big glass of orange juice is basically required. But our morning grapefruit might be in danger. Why? Citrus greening, a bacteria carried by a bug, has infected 90% of the citrus groves in Florida. It's coming for your OJ. We'll talk with University of Maryland plant virologist Anne Simon about ways to stop the citrus killer, and with science writer and journalist Maryn McKenna about why throwing antibiotics at the problem is probably not the solution. Related links: A Review of the Citrus Greening...